Iterative Channel Estimation for the MMSE IC-LE Turbo Equalizer: Results in Time and Frequency Domains

Conference: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
04/03/2006 - 04/07/2006 at Munich, Germany

Proceedings: TURBO - CODING - 2006

Pages: 6Language: englishTyp: PDF

Personal VDE Members are entitled to a 10% discount on this title

Makh, Vansh Pal Singh (Department of Electronics and Communication Engineering, Indian Institute of Technology Guwahati, India)
Leroux, Dominique; Godet, Annie (Signal and Communications Department, ENST-Bretagne, France)

In this paper, we describe the implementation of iterative channel estimation in time and frequency domain for the Minimium Mean Square Error Interference Canceler - Linear Equalizer (MMSE IC-LE) turbo equalizer. The implementation was done on a 32-bit fixed point TI TMS320C6201 Digital Signal Processor (DSP). Channel estimation is done using the Least Squares (LS) and the suboptimal Channel Sounding (CS) methods in time and frequency domains. Initial estimate for the channel state information (CSI) is calculated using a known training sequence inserted at the beginning of each frame and subsequently, the channel estimate is improved upon by taking advantage of the iterative process of the turbo equalizer. Simulations are carried out for transmission over the time-invariant Porat and Friedlander (P&F) and the time-varying quasi-static EQ5 channels and the performance of the equalizer in terms of bit error rate (BER) is compared for the two cases.